Mechanical horn



D. A. McCONNELL.

MECHANICAL HORN.

APPLICATION men umso. 191s.

Patented May 17, 1921.

arren STATES PATENT over-cs. DUNCAN A. McCONNELL, or MONTCLAIR, new JERSEY, ASSIGNORTO LA-s'K-ON COMPANY, A coRronA'rIoN or DELAWAR MECHANICAL HORN.

Specification of Letters Patent. Patnf d 31 3 17 1921 Application filed January 30, 1919. Serial No. 273,953.

To all whom it may concern:

Be it known that I, DUNCAN A. McGon NELL, a citizen of the United States, and resident of Montclair, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Mechanical Horns, of which the following is a specification.

My present invention relates to horns of the above type, in which a rotor, preferably having cam projections formed on one face, is used to vibrate the diaphragm and particularly to those in which the rotor must have a predetermined relatively high speed in order to produce the proper'rate of vibration of the diaphragm which is found in practice to be most effective in producing a warning signal. The invention includes a special form and arrangement of multiplying gear, which particularly adapts the instrument for obtaining the required high speed of the rotor under conditions where only a slowly rotating source, of power is available, as for instance, where the horn is hand operated and particularly where a hand crank is employed;

Therdesirable speed for rotation of the,

rotor and the speeds conveniently obtainable prior patent to Hutchison No. 1,169,721,-

granted January 25th, 1916, and need not be here repeated.

Considered'with reference to said patent,

my invention includes improvements in the form and arrangement of the multiplying gear and rotor with respect to each other and with respect to the diaphragm, whereby a cheaper, stronger and more compact instrument is obtained and the use of beveled gears is dispensed with. The above advanfective, better protected method of oiling the parts. 4 I V i The nature and object of my inventions will be more fully understood from the following detailed description inconnection with the accompanying'drawing, in which- Figure 1' is a vertical central section of the device;

Fig. 2 is a rear elevation of the same. Referring to said drawings, the diaphragm 1, wearpiece 2, horn or projector 3, front casing 4, and clamps 5, 6, may

be of any known vor desired construction,

The supporting means niay be the same that shown 1n the prior patent toHutchison,

above cited, and may comprise the pedestal F 7, provided'with screw holes 8 for attachment to a suitable support, its upper portion 9 having vertical swivel connection wlth the shank"10, which is preferably ine tegral with the rear casing of the horn.

The latter may be held-in any desired posi- V tionjof rotary adjustment by means of the '4 I screw 11, engaging groove 12. Any other desired means of support maybe employed. j

Thehand crank 13 is mounted on the drive shaft 14, to which it is locked by a suitable means'such as the pin 15. The l I I shaft 14 is perpendicular to the diaphragm and slightly above the centerthereof. This makes the plane of rotation of the hand 7 crank parallel with the diaphragm longer for a given minimum permissible clearance for the hand The drive shaft 14- is -journaled in the:

casing 16, which is thickened, so as to pro- This gives a long'bearing'for thefshaft so to rough usage for a long time. a

On the inner endof the shaft 14 and off-. set from theinner wall of the casing 16 by preferably by expanding and rivetingover vide an inner boss .18 and an outer boss l7.

that possibility of wear is prevented, even though the instrument may bev-subjected '8'5 1 means of the boss 18, is the large gear wheel l 19. The gear 19 is securely Jheldin place-9O the out'er1end21 of the reduced portion 20 of shaft 14, thereby clamping the gear H against the annular shoulder 22. r tages are combined with a simple, more 'ef- The gear, 19 meshes with the pinion r 23 which is rigidly connected with the rotor 24 and drives the same at the proper rate,

which is predetermined by; properly selecting the number of teeth :on the pinion 23 with reference to the number of teeth on the driving'gea'r 19, For reasons tobe explained presently, the axis of the pinion and rotor is parallel with and preferably 7 directly below the aXis of the drive shaft 14.

ample peripheral bearing surfaces in the wall of the case. The latter is thickened as at 27 to give ample length for such bearing surface. The part of the stud-shaft projecting within the case is reduced, as at 28. On this stationary shaft is rotatably mounted the rigidly connected pinion 23 and rotor 24;. The rigid connection of the latter parts. is preferably accomplished by reducing and extending the hub of the pin- 7 ion to form a tubular hub 29 on which the rotor 24 is secured preferably-by riveting over the end of' the hub as at'29, thereby permanently and effectively clamping the rotor to the pinion. The thus unified rotor and pinion are held in position on the said shaft by means of lock-nuts 30, 30,,which are screwed down tight upon a still further reduced extension 31. These units bear upon the shoulder 32 of the shaft and do not clamp or bind the rotary sleeve mounted thereon.

The above construction and arrangement of parts make possible a unique, effective and well protected system of oiling for the drive shaft 14, gear 19, inion 23 and the 18, leaks outward, along the gear to the teeth thereof and oils the contacts between the gear teeth of 19 and pinion 23. The surplus oil in 34 has a free drainage downward through the vertical passage 35, into the annular space 36, formed by turning off a portion of the screw threaded periphery of stud 26. Oil collecting in the space 36. finds its way through the slotted passage 37 to the exteriorof the stud-shaft where it serves to V lubricate the inner bearing. surface of the pinion. Any oil leaking out between the sleeve end 29 and the lock-nut 3O finds its way. to the periphery of the pinion and lubricates the cams, which contact with the wearpiece 2. Surplus oil leaking out from any of the above noted places finds its way into the recess or'catch basin 38. If the oil is permitted to accumulate at this point to a slight depth, it will bathe the lowermost portion ofthe periphery, of the rotor and the latter acting as a centrifugal spreader will throw oiljupon and thereby lubricate all the movable parts within the casing.

The delicate adjustment of the face cams on the rotor with reference to the wearpiece on thediaphragin, which it is now well un-' deemed s ne y for att redi n 0t devices of this type, may be accomplished by simply rotating the stud-shaft, the screw threads 26 operating' to retract or advance the rotor, according to which way the said shaft is screwed. Vv hen the desired position of adjustment is secured, it may be rendered permanent by locking the shaft in that position by means of the lock-nut 39.

The structural strength of the whole'casing and particularly the rigidity of the bosses l7 and 27 with respect to each other, are greatly increased by the integral rib 40 which connects said .bosses.

From the. above it'will be evident that I havesucceeded in redesigning, reorganizing and recombining the same number of parts shown in the above mentioned l-lutchison patent so as to produce results equal to or better than those obtained by the structure of'said patent and at the same time gain many important advantages. For instance, the depth of the casing or body of the horn is greatlydecreased, my present structure requiring only that the depth of the casebe equal to the thickness of the rotor plus the width of the pinion plus the required amplitude of adjustn'ient of the rotor shaft to and from the diaphragm. The latter factor, the adjustment, is, only a very small fraction of an inch, and the other factors, the thickness of the rotor and the width of the pinion, may be very materially less than support and rigidity of locking .of the ad-.

j ustment.

-VVhile'l have shown and described a preferred embodiment of my invention with great particularity, it will be understood that various changes, modifications, omissions or substitutions of parts may be made without departing from the spirit of my invention. I claim I '1; In a horn of the class described, rear and front casings and a diaphragmclamped between them, in combination with means for vibrating the diaphragm, said means including a. sleeve with a rotor, and driving pinion thereon, a stationary stud shaft projecting endwise toward the diaphragm from the rear wall of the casing on the inwardly projecting portion of which said rotor and pinion are rotatably mounted, the rear portion of said stud shaft extending through the rear wall of the casing and having screw connection therewith, accessible from the exterior of the casing for endwise adjustment of the rotor to and from the diaphragm, a rotatable driving shaft extending through the rear wall of the casing with its axis parallel to said stud shaft, a large gear mounted Q the inner end O sai d iv g between them, in combination with means for vibrating the diaphragm, i said means including a rotor, a driving pinion therefor,

a stationary stud shaft projecting endwise toward the diaphragm from the rear'wall of the casing on the projecting portion of which said rotor and pinion. are rotatably mounted, the rear portion of said stud extending through the rear wall of the casing and having screw connection therewith, accessible from the exterior of the casing for endwise adjustment of the rotor to and from the diaphragm, a rotatable driving shaft extending through the rear wall of" the casing with its axis parallel to said stud shaft, a large gear mounted on the inner end of said driving shaft and engaging said pinion.

'3. In a horn of the class described, rear and front casings and, clamped between them, a diaphragm having a suitable wearpiece, in combination with means for vibrating the diaphragm, said. means including a rotor, a driving pinion therefor, a

shaft on which saidrotor and pinion are mounted, said rotor shaft being mounted in the rear wall of the. casing and projecting endwise toward the; diaphragm, a driving shaft extending through the rear wall of the casing with its axis parallel to said rotor shaft, a large gear-mounted onithe inner end of said drive shaft and engaging said pinion, said drive shaft being located above the levelof the diaphragm wear-piece and said rotor shaft below and midway'between said wear-piece and the bottom of the cas ing'so that the lower portion of its, periphery rotates adjacent the lowermost I clamping point of the diaphragm, whereby a body of oil may be maintainedinlubricating re; lation to the periphery'of the rotor without damping the to and fro movements of the diaphragm. I V c g 4. In a horn of the class described, rear and front casings and, clamped between them, a diaphragm havinga' suitable wearpiece, said rear casing consisting of a casting having its rear wall approximately parallel with and of approximately the same diameter as the unclamped portion of the diaphragm, in combination with means for vibrating the diaphragm, said means includ ing a rotor, a driving pinion therefor, a

shaft on which said rotor and pinion are mounted, said rotor shaft being mounted in the rear wall of the casing and projecting endwise toward the diaphragm, a driving shaft extending through the rear wall of the casing with its axis parallel to said said pinion, .said drive and rotor shafts having their axes in the same vertical plane with the wear-piece, the drive shaft being above the level of the wear-pieceandthe rotorshaft below- 'saidlevel. V

'5. In a horn of the class described, rear and. front casings and, clamped between them, a diaphragm having a suitable wearpiece, in combination with means, forvibrating the diaphragm, said means including a rotor, a driving pinion therefor, a shaftron which said rotor and pinion are 'mounted,

said rotor: shaft being mounted in the rear wall ofthe casing and projecting endwise .toward the diaphragm, a driving shaft extending through the rear wall of the casing with its axis parallel to said rotor shaft,alarge gear mounted on the inner end of said-drive shaft and engaging said, pinion, said drive shaft being located above the level of the diaphragm wear piece and said rotor shaft below and midway between said wear-piece and the bottom of the casing so that the lower I portion of its periphery rotates adjacent the lowermost clamped portion of the dia phragm, said parts'beingformed with an oiling system comprising a. downwardly extending passage in the casing'leading to the drive-shaft intermediate its ends, aipa'ss'age around the periphery of said drive shaft, a

9 5 downwardly extending passage leading from" the latter to the rotor shaft, a passagearound I the periphery of thelatter, "1 a r 6. In a horn of the class described, rear and front casings and a diaphragm clamped between them, the rear casing-- consisting of I a casting of much lesslength than diameter havingitsrear endof approximately the full diameter of the unclamped portion of the" diaphragm, in combination with means" for vibrating the diaphragm, said means includ-- ing a rotor',ardriving pinion therefor, a stationary stud projecting endwise toward the diaphragm fromithe'rear wall of the-casings on the inner. end of which said rotor and, 1 V

pinionare rotatably mounted, said stud ex,

' tending through the rear-wall of the casing andhaving screw connection therewith, accessible from'the exterior of the casing for endwise adjustment ofthe rotor to and from thediaphragm, a'rotatable driving shaft extending through the rear wall of thecasing with its axis parallel to said, stud shaft, a large gear mounted onthe inner end of said driving'shaft and engaging said pinion,sai d rear wall of the casing being thickened adj a-. cent'the drive shaft and the rotorshaft to afford long bearing surfaces therefor. I

7.In ahorn of the class describechiear and front casings and a diaphragm clamped 12 between them, in combination with means for vibrating the diaphragm, said means including a rotor, a driving pinion therefor, a sta tionary stud projecting endwise toward the diaphr gm. from t e rear Wa fthe casing I rear wall of the casing being thickened to form exterior and interiorbosses affording long bearing surface for the drive shaft and for the rotor shaft.

8. In a horn of the class described, rear and front casings and a diaphragm clamped between them,-in combination with means for vibrating the diaphragm, said means includ- 'ing a rotor, a driving pinion therefor, a stationary stud projecting endwise toward the diaphragm from the rear wall of the casing on the inner end of which said rotor and pinion are rotatably mounted, said stud extending through the rear wall of the casing and having screw connection therewith, ac-

icessible fromthe exterior of the casing for endwiseadjustment of the rotor toand from the diaphragm, a rotatable 'driving'shaft extending through the rearwall'of the casing with its axis parallel to said stud shaft, a

5 large gear mounted on the inner endof said driving shaft and engaging said pinion, said rear wall of the casing being thickened to' form exterior and interior bosses affording long bearing surface for the drive shaft and for the rotor shaft and a strengthening and V V supporting rib extending between said bosses.

V 9. In ahorn of the class described, rear and front casings and a diaphragm clamped between them, in combination with means for vibrating the diaphragm, said means including a rotor, a driving pinion therefor, a stationary stud projecting endwise toward the diaphragm from the rear wall of the casing'onthe inner end of which said rotor and pinion are'rotatably mounted, said stud extending'through the rear wall of the eas- I ing and having screw connection therewith,

accessible from the exterior of the casing for endwise adjustment of the rotor to and from the diaphragm, a rotatable driving shaft extending through the rear wall of the casing with its axis parallel tosaid stud shaft, a large "gear mounted on the inner end of said driving shaft and engaging said pinion, said parts being formed with an oiling system comprising a downwardly extending passage in the casing leading to the drive shaft intermediate its ends, a pas sage around the periphery of said shaft, adownwardly extending passage leading from said peripheral passage to a'passage around the periphery of said stud shaft, and a l g di l p g n the stud sha t e d.-

.ing from saidperipheral passage lengthsaid stud extending through the rear wall of the casing and having screw connection therewith, accessible from the exterior of the casing for endwise adjustment of the rotor to and from the diaphragm, ti-rotatable driving shaft extending through the rear wall of the casing with its axis parallel to said stud shaft, a large gear mounted on the inner end of saiddriving shaft and engag ing said pinion, said rear wall ofqthe casing 7 being thickened to form exterior'andjinterior bosses affording long bearing surfaces for the driveshaft and for the rotor shaft and a strengthening and supporting rib extending between said bosses, said parts being formed with an oiling system comprising a downwardly extending passage in theupper boss leading to the drive shaft intermediate its ends, a passage around the periphery of said shaft, a downwardlyextending passage lengthwise through said rib leading from said peripheral passage'to a passage around the periphery of said stud shaft and a len gitudinal passage in the stud shaft leading from said peripheral passage lengthwise of the stud and opening through the bearing surface thereof in operative relation to the bearing surfaces of the pinion and rotor.

11. Ina horn of the class described, rear and front casings and, clamped between them,a diaphragm having a suitable "wearpiece, said rear casing consisting of a. casting having its rear wall approximately parallel with and of approximately the. same diameter as the unclamped portion of the diaphragm, in combination with means for vibrating the diaphragm, said means including a rotor, a driving pinion therefor, a shaft on which said rotor and pinion are mounted, said rotor shaft being mounted in the rear wall of the casing and projecting endwise toward the diaphragm, a driving shaft extending through the rear wall of the casing withits axis parallel tosaid .rotor shaft, a large gear mounted on the inner end of said driving shaft-and engaging said pinion.

'12. In a horn of: the ,class described, rear and front casings and, clamped between them, a diaphragm having a suitable wear-v piece, in combination with means for vibrating the diaphragm, said means including a rotor, a driving pinion therefor, a shaft on which said rotor and pinion are mounted, said rotor shaft being mounted in the rear wall of the casing and projecting endwise toward the diaphragm, a driving shaft eX- tending through the rear wall of the easing with its axis parallel to said rotor shaft, a large gear mounted on the inner end of said driving shaft and engaging said pinion, said rear wall of the casing being a casting having its rear wall approximately parallel with and of approximately the same diameter as the clamped portion of the diaphragm, said rear wall being thickened to form exterior and interior bosses affording long bearing surfaces for the drive shaft and for the rotor shaft.

13. In a horn of the class described, rear and front casings and, clamped between them, a diaphragm having a suitable wearpiece, in combination with means for vibrating the diaphragm, said means including a rotor, a driving pinion therefor, a shaft onwhich said rotor and pinion are mounted, said rotor shaft being mounted in the rear Wall of the casing and projecting endWise toward the diaphragm, a driving shaft extending through the rear Wall of astrengthening and supporting rib extending between said bosses.

Signed at Newark. in the county of Essex and State of New Jersey this 27th day of January, A. D. 1919.

DUNCAN A. MQCONNELL. 

